Ignition coil



@ctn 1L 1932. B. H. A. WALLENTA IGNITION COIL Filed Feb. 4, 1951 Bernard fiifi [71/51/9775 75 urne Patented Oct. 11, 1932 UNITED STATES 1,&82,460

PATENT OFFICE BERNARD H. A. WALLENTA, OF WESTERN SPRINGS, ILLINOIS, ASSIGNOR TO KELLOGG SWITCHBOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS IGNITION COIL Application filed February 4, 1931. Serial No. 513,380.

My invention relates to ignition coils, and more particularly to those coils which are used for supplying a spark for'the operation of internal combustion engines.

A feature of my invention is the provision of acorrugation or corrugations on the cap of the coil to decrease the possibility of current leakage between the high tension terminal of the secondary winding and the low tension terminals of the primary winding.

Another feature of my invention is the provision of an annular insulating "flange on the under side of the cap of the coil, which acts as a baffle plate to prevent leakage of current between the secondary winding and the terminals of the primary winding.

A still further feature of my invention is the provision of laminations around the primary or outer winding of the coil, each lamination being provided with a gap or space between its longitudinal edges, the said gaps being apart about the periphery of the coil.

Other features of my invention will appear from time to time in the ensuing specification and the appended claims.

For a more complete understanding of my invention, reference may be had to the accompanying drawing, in which Fig. 1 is a vertical cross-section of my coil,

Fig. 2 is a top view of the same,

Fig. 3 is a section taken along the line 33 of Fig. 1, and

Fig. 1 is a sectional View of a cap having 7 a spiral shoulder, and the laminations around the coil.

Referring now to the drawing, in which like reference characters designate like parts in the several views, a core 11, which may consist of a number of annealed iron wires or any suitable substance, has wound on it a secondary winding 12 and a primary winding 13, all insulated from each other by paper wrapping or any convenient insulation, and enclosed in the container 1 1, all of which is well understood in the art.

The cap 15, which is of molded bakelite, hard rubber, or any similar substance, is provided with the primary winding terminal 16 and 17 and the secondary terminal 18. The cap 15 is further provided with one or more corrugations or shoulders 19 which may be annular corrugations as shown in the drawing, or may be in the form of a single spiral shoulder extending around the cap and downwardly from the tip 20 to the lower part 21, or any shape and size which may be conveniently molded. The purpose of this shoulder is to ofier an obstruction to the path of currents which may tend to leak over the surface of the cap between the secondary terminal 18 and the primary terminals 16 and 17.

(hi on the under or inner side of the cap 15 a downwardly extending annular flange 22 is molded. In assembling the coil, this flange is pressed into the paper wrapping of the primary winding 12, and forms a baffle to provide additional insulation against leakage of current between the inner terminal 23 of the secondary winding 12 and the terminals 16 and 17 of the primary winding.

Around the outer or primary winding 13 are placed the laminations 241 and 25. One or more of these laminations may be used, according to the needs of the particular coil. It has been the practice in the past to make these laminations of a single sheet of metal helically wrapped around the coil to the desired thickness. In the coil of my inven tion the laminations are each made of a separate sheet of metal, cut to such a length that, when wrapped around the coil, the longitudinal edges do not quite meet. The layers are then arranged so that the gaps left between the edges of the sheets are spaced apart about the periphery of the coil. This arrangement is clearly illustrated in Fig. 4 of the drawing, which shows three laminations, 26, 2? and 28, with the spaces 29, 30 and 3 lifferent points about the periphery, or staggered. I has been found that this arrangement of the laminations, provides a more eiiicient operation of the coil. After the coil is assembled, all the space between the various parts and the shell 14.- is filled with wax or other insulating material (not shown) as is well understood in the art.

While I have illustrated and described a preferred embodiment of my invention I do not, however, wish to be limited to the exact structure as shown, but aim to cover all that comes Within the spirit and scope of the appended claims.

Having described my invention, What I claim as new and desire to secure by United States Letters Patent, is:

1. An ignition coil of the character described including a core, an inner and an outer Winding, a container, and a substantially cone-shaped insulating cap, said cap having a spiral shoulder on the outer surface thereof between the base and the apex;

2. An ignition coil of the character described including a core, an inner and an outer Winding a container, and a substantially cone-shaped insulating cap, said cap having annular flange on the under surface thereof and eXtending downivardly into said coil, and said cap having also a spiral shoulder on the outer surface thereof between the base and the apex.

3. An ignition coil of the character described, including a core, an inner and an outer Winding, a container, a cone shaped insulating cap, a spiral shoulder on said cap, and a plurality of substantially cylindrical shaped concentric laminations around said outer Winding, said laininations having their longitudinal edges spaced apart to provide gaps, said gaps being spaced about said coil.

Signed by me at Chicago, in the county of Cook and State of Illinois, this 3rd day of February, 1931.

BERNARD H. A. WALLENTA. 

